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2008MNRAS.385..769B - Mon. Not. R. Astron. Soc., 385, 769-782 (2008/April-1)
New insights into the stellar content and physical conditions of star-forming galaxies at z = 2-3 from spectral modelling.
BRINCHMANN J., PETTINI M. and CHARLOT S.
Abstract (from CDS):
We also uncover a relationship in SDSS galaxies between their location in the [Oiii]/Hβ versus [Nii]/Hα diagnostic diagram (the BPT diagram) and their excess specific star formation rate relative to galaxies of similar mass. We infer that an elevated ionization parameter U is at the root of this effect, and propose that this is also the cause of the offset of high-redshift star-forming galaxies in the BPT diagram compared to local ones. We further speculate that higher electron densities and escape fractions of hydrogen ionizing photons may be the factors responsible for the systematically higher values of U in the HII regions of high-redshift galaxies. The impact of such differences on abundance determinations from strong nebular lines are considered and found to be relatively minor.
Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): stars: early-type - stars: Wolf-Rayet - galaxies: abundances - galaxies: evolution - galaxies: high-redshift - galaxies: starburst
Simbad objects: 4
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